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Insights into the Resorcinol-Formaldehyde Resin Coating Process Focusing on Surface Modification of Colloidal SiO2 Particles.
Langmuir ( IF 3.7 ) Pub Date : 2020-03-03 , DOI: 10.1021/acs.langmuir.9b03595 Xin Wang 1 , Shuying Li 1 , Guangsheng Yang 1 , Changzi Jin 2 , Shengjun Huang 2
Langmuir ( IF 3.7 ) Pub Date : 2020-03-03 , DOI: 10.1021/acs.langmuir.9b03595 Xin Wang 1 , Shuying Li 1 , Guangsheng Yang 1 , Changzi Jin 2 , Shengjun Huang 2
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This article provides a systematic study on the resorcinol-formaldehyde (RF) resin coating via a sol-gel process with focus on surface modification of the core. With colloidal SiO2 particles as the model core material, diverse surface modification methods were investigated to verify the feasibility of subsequent RF coating process. It is confirmed that the RF coating is strongly influenced by surface charge of the SiO2 core, which can be adjusted by suitable surface modification. Both cationic surfactant and amino functional group can modify the silica surface with positive charge, and it is readily coated with the negatively charged RF resin. The primary amine surfactant with positive charge fails to induce the RF coating onto the SiO2 particles, which may be due to the relatively weak interaction between the surfactant and silica. In addition, the negatively charged sulfydryl functionalization also contributes to a successful coating probably through the gathering of cationic ions around the core. The RF coating process has opened a versatile avenue for the construction of yolk-shell carbon-encapsulated nanocomposites. Catalytic tests indicate that the catalytic performances of the synthesized nanocomposites depend strongly on the method of synthesis.
中文翻译：
关于间苯二酚-甲醛树脂涂层工艺的见解，重点关注胶体SiO2颗粒的表面改性。
本文通过溶胶-凝胶工艺对间苯二酚-甲醛（RF）树脂涂层进行了系统研究，重点研究了芯的表面改性。以胶体SiO2颗粒为模型核心材料，研究了多种表面改性方法，以验证后续RF涂层工艺的可行性。可以确定的是，RF涂层受到SiO2核表面电荷的强烈影响，可以通过适当的表面改性对其进行调节。阳离子表面活性剂和氨基官能团都可以用正电荷修饰二氧化硅表面，并且很容易用带负电荷的RF树脂涂覆。带正电荷的伯胺表面活性剂不能将RF涂层诱导到SiO2颗粒上，这可能是由于表面活性剂与二氧化硅之间的相互作用较弱所致。此外，带负电荷的巯基官能化也可能通过在核心周围聚集阳离子来促进成功的包衣。RF涂层工艺为卵黄壳碳封装的纳米复合材料的构建开辟了一条通用的途径。催化测试表明，合成的纳米复合材料的催化性能在很大程度上取决于合成方法。
更新日期：2020-03-04
中文翻译：
关于间苯二酚-甲醛树脂涂层工艺的见解，重点关注胶体SiO2颗粒的表面改性。
本文通过溶胶-凝胶工艺对间苯二酚-甲醛（RF）树脂涂层进行了系统研究，重点研究了芯的表面改性。以胶体SiO2颗粒为模型核心材料，研究了多种表面改性方法，以验证后续RF涂层工艺的可行性。可以确定的是，RF涂层受到SiO2核表面电荷的强烈影响，可以通过适当的表面改性对其进行调节。阳离子表面活性剂和氨基官能团都可以用正电荷修饰二氧化硅表面，并且很容易用带负电荷的RF树脂涂覆。带正电荷的伯胺表面活性剂不能将RF涂层诱导到SiO2颗粒上，这可能是由于表面活性剂与二氧化硅之间的相互作用较弱所致。此外，带负电荷的巯基官能化也可能通过在核心周围聚集阳离子来促进成功的包衣。RF涂层工艺为卵黄壳碳封装的纳米复合材料的构建开辟了一条通用的途径。催化测试表明，合成的纳米复合材料的催化性能在很大程度上取决于合成方法。
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